Landing doorlock



J. A. BRUBAKER LANDING nbonLocK Filed Oct. 18. 1924 Feb. 16 1926.

2 Sheets-Sheet 1 Patented Feb. 16, 1926.

UNITED STATES 1,573,140 PATENT OFFICE.

JOHN A. BRUBAKER, or TOLEDO, OHIO, ASSIGNOB TO THE HAUGII-ITON ELEVATOR & MACHINE COMPANY, or TOLEDO, OHIO, A CORPORATION or OHIO.

LANDING DOORLOCK.

Application filed October 18, 1924. Serial No. 744,338.

To (1. 1 011720271 it may concern: 7

Be it known that I, JOHN A. BRUBAKER, a citizen of the United States of America, residing at Toledo, Lucas County, Ohio, have invented new and useful LandingDoorlocks, of which the following is a specification.

This invention relates to door latches as rendered inoperative for nnlatching to thereby lock the door.

This invention has utility when incorporated in connection with landing door latches.

Referring to the drawings:

Fig. 1 is a fragmentary view of an embodiment of the invention in connection with an elevator;

Fig. 2 is an enlarged View on the line II- II, Fig. 1, parts being broken away;

Fig. 3 is a fragmentary view on the line III-III, Fig. 2; v 7 Fig. 4 is a view similar to Fig. 2 with the landing side manually operable member thrown for effecting door unlatching but ineffective therefor due to the shifting of the rocker arm;

Fig. 5 is a view similar to Fig. 4 wherein an abutment is held and the shifting to unlatching position is 'rendered effective;

Fig. 6 is a section on the line VI- V I-, Fig. 5; 1

Fig. 7 is a section on the line VIIVII,

Fig. 6;

Fig. 8 is a section on the line VIIIVIII, Fig. 7 and Fig. 9 is a perspective view of the rockable abutment control connection between the latch and latch operating member.

Elevator shaft 1 is shown as provided with landings 2. Inthis shaft 1 is car 3 perated by hoisting line i from drum 5 as operated by motor 6. In thecar 3 is a pushbutton bank 7 having among its connections for elevator operation, supply control line 8 extending to contact 9 in housing 10. In this housing 10 is contact roller 11 which in its lower position engages terminal 12 (Fig. 8) opposite the terminal 9 so that current connection is made therebetween to succeeding sections 13 of the line:8 as pastthese interlock switches 9, 11, 12., at the several landings, and thence to switchboard lll.

At each landing 2 mounted by hinges 15 is door 16 carrying on-its innerside brackets js 'g i it fia g {bar acti g to at h 19 in which is mounted the roller 11. This latch 19 extends through opening 20 in the housing 10, and as settling down, after guide thrust into the housing as effected by bevel 21 on the lower side of the projection of this latch 19, has throat 22 coact with the wall as holding the latch to resist swinging open of the door 16. This rod 18 is onthe elevator shaft or wallside of the door 16 so that at all times anyone in the elevator shaft, if within the region of the door 16, may open such door by thrust upward of this rod 18 thereby opening inter-locking switch 9, 11, 12, sothat further travel of the car 3 may not, occur. Then a swinging of the door 16 upon its hinges 15 withdraws the latch 19 from the housing 10 and the door 16 opened to permit the one in the elevator shaft to have access to the landing 2 outside the elevator shaft. 7

'On the landing or outer side of the door 16, guides 23 are provided fora second control bar 24; in addition to the control bar from rod 18. This reciprocable bar 24 is slidabl'e in the guides 23 and at its clownward limit of travel is supported by head portion 25. Adjacent this head portion 25 of the manually operable member 24 is opening 26 through the door 16. Hinge pin 27 through the member 19 and cars 28 of angle lever -member or connection 29 pivotally mounts this angle lever upon this latch member 19. This angle lever has arm 30 extending through the opening 26 into the line of travel of the head 25 of the member 24. The degree of downward rock of this arm 30 upon the pivot pin 27 is adjusted by set screw 31 as engaging the latch member 19. This angle lever 29 has second arm 32 upwardly extending alongside the latch member 19. .Under normal conditions, an attempt by one at a landing 2 to enter the elevator shaft 1 may not occur because an upward thrust of the bar 24 would not oper ate through an effective connection for lifting the latch .19. This is because as the head 25 engages the arm 30 this angle lever swinging movement adjacent the box or housing '10.

trigger or arm 36 normally horizontally extending. Counter-weighted portion 37 of this trigger 36, S7, maintains this arm 36 in its normally horizontal position but allows the arm to rock freely on its pivot so that in the event of any lifting of the bar 24 which may occur while the car 3 or any object is in motion in the shaft 1, the thrusting of such car by the arm will not hold the abutment, but rock on its pivot pin 35 and leave the abutment 33 free to swing as actuated by the arm The rockable connection from the bar 2%, to the latch member 19 is still ineffective from the outer side of the door 16.

The normal operation, afterthe car 3, is brought to a landing by push-button 3S and there stopping, may be brought about by the one desiring admission to the car then 'ihrusting upward the bar 2% The arm 30 of this angle lever 29 as carriedby the latch 1,5.) at once tends to rock in throwing the arm 32 against the abutment With the car 3 at rest in the shaft 1, stop portion 39 on such car 3 min position to be abutted by the arm 36. In practice this shifting of the abutment to engaging position for the arm 36 may be one-eighth to three-sixteenthsof an inch. As the car is at rest and the end of the arm 36 is in the line of thrust of the abutment 33 and the pivot mounting 35 for the arm 36, there is no tendency to rock the arm 36 and the abutment 33 is held. Accordingly, as this lost motion is taken up in the movement of the arm 24:, thereafter the angle lever 29 instead of being a rockable connection is a held connection between the bar 24- and the latch 19 so that the'latch 19 maybe lifted in the housing 10 to clear the roller 11 of the opposing contacts 9, 12, thereby at once breaking control connections from the elevator car 3 precluding one at another landing in the shaft 1 to elsewhere bring the car 3. This lifting movement of the latch 19 also clears the throat 22 in the lower edge of the opening 20 in the housing 10 so that the door 16 may be swung away from the elevator shaft 1 on the hinges lfi to open the door so that such a one at the landing may have access to the car .3. It is thus seen that access from a landing to the elevator shaft may occur only with the elevator car at the landing.

\Vhat is claimed and it is desired to secure by Letters Patent is 2- 1. A switch, a housing therefor, a bar novable into latching engagement with said housing and simultaneously in itself posi tively closing said. switch, first and second control means for effecting unlat-chingshifting ofthebar.

2. A switch, a housing therefor, a bar movable into lat'ching engagement with housing and simultaneously in itself post-j closing said sw tch, first and award.v

tively from rocking and a stop movable to position adjacent control means for effecting unlatching sl1ift ing of the bar, and means rendering one of said controls ineffective.

3. A switch, a housing therefor, a bar movable into-latching engagement with said housing and simultaneously in itself positively closing said switch, first and second control means for effecting unlatching shifting of the bar, one of said controls including a rockable element, and intercepting means holding said element against rocking to permit unlatching effecting operation of said control.

a. A. door, a jamb for the door providing a catch, a reciprocable latch member carried by the door for engaging the catch for holding the door in closed position as to the jamb, a manually shiftable member carried by the door away from said latch member, and a normally ineffective connection between said members including a men'iber rockably mounted on said manually shiftable member. I

5. A door, a jamb for the door providing a catch,a reciprocable latch member carried by the-door for engaging the catch for hold: ing the door in closed position as to the jamb, a manually shiftable member carried by the door away from said latch member, a normally ineffective connection between said members including a member 1 rockably mounted on. said manually shiftable member, and an abutment providing device rendering said connection effective.

6. A door, a jamb for the door providing acatch, a reciprocable latch member carried by'the door for engaging the catch for holding'the door in closed position as to the jamb, a manually shift-able member carried by the door away from said latch member, a rocker mounted on one member to be thus carried by the door and disposed for interception the other member, and an abutment providing device for holding the rocket to thereby render said manually shiftable member effective for unlatching the door.

7. A door, a jamb for the door provid ng a catch, a reciprocable latch member carried by the door for engaging the catch for holding the door in closed position as to the jamb, a manually shiftable member carried by the door away from said latch member, a rocker mounted on one member to be thus carried by the door and disposed for inter,- cepting the other member, a shiftable abutment for holding the rocker from rocking, sau: door and there to provide a holder for the -shiftable abutment, wherebysaid manually shiftable member may be effective for unlatching the door. I

8. An elevator shaft, an elevator car thereinja landing, a door closing the landing sea the shafts latch forthe clear, and a manually operable member, and a connection extending from the member to the latch comprising a relatively movable connection disturbing element and a pivotal mounting for the element shiftable as to the door.

9. An elevator shaft, an elevator car there in, a landing, a door closing the landing from the shaft, a latch for the door, a man-- ually operable member, a connection extending from the member to the latch and comprising a relatively movable element, a pivotal mounting for the element shiftable as to the door and normally movable means as coacting with the car rendering said manually operable member effective through said connection and element for shifting the latch for unlatching the door.

10. An elevator shaft, an elevator car therein, a landing, a door closing the landing from the shaft, a latch for the door, a first operative means at all times accessible for operation from the shaft side of the door, and an additional operative means for the latch including a connection normally ineffective for shifting the latch as said connection is thrust against the moving car independently of the position of the car.

11. An elevator landing door, a latch including a reoiprocable member, a catch for holding the member in door latching position, a manually operable member, a normally ineffective connection therefrom to said latch, a shiftable abutment, and a car engaging arm swingable on the abutment, a counterweight for swinging the arm toward thecar at rest for holding the abutment to render said manually shiftable member effective through said connection as contacting and holding the abutment for operating with the latch, said aim being rockable by the moving car independently of member shifting to defeat abutment holding and thereby preclude manually operable member release of said latch through said connection.

12. An elevator landing door, a latch including a member reciprocable relatively to the door, an angle lever pivotally mounted on said member and having tWo arms, a manually operable member movable to engage one arm, and a shiftable abutment cacting as held to engage the other arm of the lever whereby said lever is an effective connection for member operation to shift in unlatching said door.

In Witness whereof I aflix my signature.

JOHN A. BRUBAKERa 

